Amplifier System With Digital Adaptive Power Boost
a technology of amplifier system and power boost, which is applied in the direction of amplifier details, differential amplifier, amplifier with semiconductor device/discharge tube, etc., can solve the problems of system power dissipation, significant amount of wasted power, and system power dissipation. unnecessary, conventional amplifier system with on-demand power supply boos
Active Publication Date: 2010-09-23
ANALOG DEVICES INC
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Benefits of technology
The present invention relates to an amplifier system with on-demand power supply boost. The technical effect of this invention is to provide a more power efficient amplifier system with on-demand power supply boost, by reducing unnecessary power dissipation. The conventional amplifier system with on-demand power supply boost has unnecessary power dissipation because transistors in the system work as voltage followers and remain on, even when the input does not peak. The invention proposes a charge pump that can adjust the power supply voltage based on the input signal peaks, and a mixer that ensures proper swing polarity reaches the amplifier.
Problems solved by technology
For conventional amplifier systems (Class AB) with fixed supplies and processing signals with high peak-to-average (PAR) and low percentage actuation, there is a significant amount of wasted power.
However, the conventional amplifier system with on-demand power supply boost still has unnecessary power dissipation.
Even with its power savings over conventional class AB systems, this on-demand amplifier system has unnecessary power dissipation, since transistors QA and QB work as voltage followers and remain on, and VCCP and VEEP vary continuously in correspondence with input signals at the terminal 102 even when the input does not peak (e.g., before t1 in FIG. 2) and it is unnecessary to compensate for excessive peaks.
Method used
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[0029]The present invention provides the conventional amplifier system of FIG. 1 with an improved charge pump to increase the power efficiency of an amplifier system. The charge pump may switch between a fixed input DC voltage and a boosted value for a certain period of time in response to an increase in an input signal to the amplifier. The charge pump may use a switching transistor which is switched on only when the input signal to the amplifier exceeds a threshold. The amplifier system may be used for envelope tracking, especially for envelope tracking of low duty cycle signals, e.g., Code Division Multiple Access (CDMA), Enhanced Data rate for GSM Evolution (GSM-EDGE) or other conventional cellular systems. The amplifier system may also be used for high peak-to-average systems with low duty cycles such as in xDSL, ADSL and VDSL telco operations.
[0030]FIG. 3 is a circuit diagram of a charge pump 300 according to one embodiment of the present invention which may replace the charge...
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An amplifier system with digital adaptive power boost includes a charge pump for providing a power supply to an amplifier. The charge pump may switch between a fixed input DC voltage and a boosted value for a certain period of time in response to an increase in an input signal to the amplifier. The charge pump may use a switching transistor which is switched on only when the input signal to the amplifier exceeds a threshold. The amplifier system may be used for envelope tracking, especially for envelope tracking of low duty cycle signals, e.g., xDSL or vDSL.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to U.S. Provisional Patent Application No. 61 / 162,180, filed on Mar. 20, 2009, entitled “Amplifier System with Digital Adaptive Power Boost,” which is herein incorporated by reference in its entirety.BACKGROUND INFORMATION[0002]The present invention relates to an amplifier system with on-demand power supply boost.[0003]Amplifier efficiency is the ratio of power supplied by an amplifier to a load to the power supplied to the amplifier. The less power dissipation in an amplifier, the better the efficiency of the amplifier. For conventional amplifier systems (Class AB) with fixed supplies and processing signals with high peak-to-average (PAR) and low percentage actuation, there is a significant amount of wasted power. One method to reduce power is the on-demand power supply boost system which uses Class H technology on a much lower power supply voltage. However, the conventional amplifier system with on-deman...
Claims
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IPC IPC(8): H03F3/45
CPCH03F1/0222H03F2203/45138H03F2200/78H03F3/45475
Inventor PIERDOMENICO, JOHNFRASCH, ZOLTANEL-KHOURY, CHARLY
Owner ANALOG DEVICES INC